4.4 differential broke . ? from staggered rims

[Roman D]

yes, I mean - may be, but THEY ALL MUST BE THE SAME!!!
You are killing me man, you really don't understand what happened?
Take to different diameter glasses/cups/whatever is round, put a mark at the edge, lay it down on the side with mark up. Roll each 5 times and you will see that object with bigger diameter went further. Now, think about this: power comes out of transmission in to differential, and it equally gives both driveshafts 5 rotations (for example) the axcel with 275/40 would obviously try to travel longer distance then axcel with 315/35, the differential ate up that difference up until it destroyed itself.

[Joshdub]

Originally Posted by Roman D

yes, I mean - may be, but THEY ALL MUST BE THE SAME!!!
You are killing me man, you really don't understand what happened?
Take to different diameter glasses/cups/whatever is round, put a mark at the edge, lay it down on the side with mark up. Roll each 5 times and you will see that object with bigger diameter went further. Now, think about this: power comes out of transmission in to differential, and it equally gives both driveshafts 5 rotations (for example) the axcel with 275/40 would obviously try to travel longer distance then axcel with 315/35, the differential ate up that difference up until it destroyed itself.

275/40 has the same diameter as 315/35. It's also the OE setup for iS models from the factory.

[kashmir]

Originally Posted by Roman D

yes, I mean - may be, but THEY ALL MUST BE THE SAME!!!
You are killing me man, you really don't understand what happened?
Take to different diameter glasses/cups/whatever is round, put a mark at the edge, lay it down on the side with mark up. Roll each 5 times and you will see that object with bigger diameter went further. Now, think about this: power comes out of transmission in to differential, and it equally gives both driveshafts 5 rotations (for example) the axcel with 275/40 would obviously try to travel longer distance then axcel with 315/35, the differential ate up that difference up until it destroyed itself.

thanks....that is a good way to explain what a significant variance in rolling diameter can do....but i think you are confusing aspect ratio with diameter....as joshdub pointed out their rolling diameter is almost same

i confirmed with this calculator

Tire Size Calculator - Tire & Wheel Plus Sizing

[Roman D]

well, I guess you know better. There is always a possibility that it was simply time for that differential to become broken
But I am having hard time accepting that 275/40 has the same diameter as 315/35.
The length of the circle is 2PiR
Where We have 275x40, 40mm (4 centimeters) height of the tire which we will add to the diameter of a rim on both sides.... 4+50.8(diameter of the rim)+4= 58.8, where radius would be precisely half, 2 x 3.14 x 29.4 = 184.73
Where we have 315x35... (3.5 centimeters)
3.5+50.8+3.5=181.58

According to that wheel with tire that has a wall height of 40mm will have 184.73cm outer length and the one with 35mm wall height will have 181.58 cm outer length which is not the same.
Am I overthinking the situation?

[EH6TunerDaniel]

It wouldnt take 25k to break it if it were caused by the wrong diameter tires. Also, those sizes, assuming the same brand, are only 2 hundredths of an inch different in diameter which is nothing in this case.

[EH6TunerDaniel]

Roman, you are having problems comprehending because you have it wrong in your head. the second number is not millimeters, but instead a percentage of the first number. The sidewalls on the 275/40s are 110 mm tall and the sidewalls on the 315/35s are 110.25 mm tall.

[Junkycosmos]

Kashmir,
Yes those were oem size setup on the 4.8is e53. What about your diff broke ?
As for 8 hrs, given the have to drop the subframe to remove the diff, front axles, and the bolts are hard to reach that doesn't sound too bad.

J

[X53Jay4.8is]

Originally Posted by Roman D

if you measure you wheel height or outer diameter, you will get a significantly different numbers. If a tire shop did this installation for you and did not give you any warnings - do not go there ever again.

You need to check your math again. His tires/wheels are the same height between front and rear. Plus as was stated this is a factory sized spec'd tire set. He did not mess up his diff with these tires.

[X53Jay4.8is]

Originally Posted by Roman D

well, I guess you know better. There is always a possibility that it was simply time for that differential to become broken
But I am having hard time accepting that 275/40 has the same diameter as 315/35.
The length of the circle is 2PiR
Where We have 275x40, 40mm (4 centimeters) height of the tire which we will add to the diameter of a rim on both sides.... 4+50.8(diameter of the rim)+4= 58.8, where radius would be precisely half, 2 x 3.14 x 29.4 = 184.73
Where we have 315x35... (3.5 centimeters)
3.5+50.8+3.5=181.58

According to that wheel with tire that has a wall height of 40mm will have 184.73cm outer length and the one with 35mm wall height will have 181.58 cm outer length which is not the same.
Am I overthinking the situation?

Your mis reading aspect ratio

[upallnight]

Originally Posted by X53Jay4.8is

Your mis reading aspect ratio

Sidewall Aspect Ratio
Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

P225/50R16 91S

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.